one of defect vs one of drawback ,which one is correct , example

● one of defect vs one of drawback ,
    which one is  correct , example ?

RULE-  ONE OF + (हमेशा) Plural subject + singular verb .

Example
■ - one of draw back  of our society is the use of alcoholic liquor.

Correct Sent-  one of defect  of our society is the use of alcoholic liquor.

Reason : draw back     -  (singular)
                 defect            -  (Plural)

Download Yvid : Create Amazing video from your images : for you Gilrfriend , Birthday , Marriage ,GoodMorning Message

https://play.google.com/store/apps/details?id=com.torus.yvideo